Because of the input/output relationship of an AND gate it is often referred to as the ?
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Source: Telepilote theorique examen 26
The function of a NOT logic gate within a circuit is to ?
When two DC generators are operating in parallel control of load sharing is achieved by ?
A condenser in parallel with breaker points will Intensify current in secondary winding. This question about ignition on a piston engine the use of a magneto the components of a typical magneto consist of a permanent magnet a primary a secondary windings on a core a way of making magnet or core move (by rotating either one) contact breaker points a condenser (capacitor) a distributor inside primary circuit a set of conctact points that make flux reversals more abrupt when they open close at critical moments the condenser (capacitor) mainly there to absorb sparks reduce arcing to stop points getting pitted worn it connected across contact points so it shorted out when they close but instant they open it absorbs current from collapsing current in primary coil (i e it charged) so points open cleanly with very few sparks this know as a spark quench the current from capacitor when it discharges also hastens collapse of primary field (by opposing it) to increase induced voltage the more sudden breaking of primary circuit is more current will be induced in secondary coil. 
A unit that converts electrical dc into ac Intensify current in secondary winding. Dc to ac inverter ac to dc rectifier. 
On board electrical systems are protected against faults of following type 1 ac generator over voltage2 ac generator under voltage3 over current4 csd or generator over speed5 under frequency6 undue vibration of ac generatorsthe combination of correct statements Intensify current in secondary winding. The on board electrical systems are protected all of these scenarios except vibration of generator. 
The purpose of a battery control unit generally to isolate battery 1 from bus when battery charge has been completed2 when there a battery overheat condition3 in case of an internal short circuit4 in case of a fault on ground power unitthe combination which regroups all of correct statements Intensify current in secondary winding. The on board electrical systems are protected all of these scenarios except vibration of generator. Question 26-8
The resistors r1 and r2 are connected in parallel the value of equivalent resistance req so obtained given the following formula Intensify current in secondary winding. The on board electrical systems are protected all of these scenarios except vibration of generator. Question 26-9
The function of generator breaker to close when voltage of Generator greater than battery voltage to open when opposite true. The generator breaker controlled sensors that detect over/under speed (over/under frequency) reverse or over current plus control bringing generator on or offline the function of generator breaker to close when voltage of generator greater than battery voltage to open when opposite true. Question 26-10
The input and output of a static inverter are respectively Generator greater than battery voltage to open when opposite true. The generator breaker controlled sensors that detect over/under speed (over/under frequency) reverse or over current plus control bringing generator on or offline the function of generator breaker to close when voltage of generator greater than battery voltage to open when opposite true. Question 26-11
Alternating current can be derived from direct current Generator greater than battery voltage to open when opposite true. The generator breaker controlled sensors that detect over/under speed (over/under frequency) reverse or over current plus control bringing generator on or offline the function of generator breaker to close when voltage of generator greater than battery voltage to open when opposite true. Question 26-12
The rating of electrical fuses expressed in Generator greater than battery voltage to open when opposite true. The generator breaker controlled sensors that detect over/under speed (over/under frequency) reverse or over current plus control bringing generator on or offline the function of generator breaker to close when voltage of generator greater than battery voltage to open when opposite true. Question 26-13
A 'zener' diode used Voltage stabilisation. A zener diode a special kind of diode which allows current to flow in forward direction in same manner as an ideal diode but will also permit it to flow in reverse direction when voltage above a certain value but keeps it constant the zener diode used voltage stabilisation. Question 26-14
The type of gate which requires all conditions with logic 1 engagement Voltage stabilisation. A logic gate an elementary building block of a digital circuit most logic gates have two inputs one output at any given moment every terminal in one of two binary conditions low (0) or high (1) represented different voltage levels the logic state of a terminal can generally does change often as circuit processes data there are seven basic logic gates and or xor not nand nor xnor the and gate so named because if 0 called 'false' 1 called 'true' gate acts in same way as logical 'an operator the following illustration table show circuit symbol logic combinations an and gate (in symbol input terminals are at left the output terminal at right ) the output 'true' when both inputs are 'true' otherwise output 'false'. Question 26-15
To reverse direction of rotation of a shunt type parallel field dc electric motor it necessary to Reverse polarity of either stator or rotor. Changing polarity of current would change direction of field around conductor whilst leaving polarity of main field unchanged. Question 26-16
The power required field excitation of main rotor in modern constant frequency alternators directly controlled The voltage regulator. When a brushless generator's rotor initially driven the csd unit a permanent magnet generator induces an ac voltage into pilot output the ac voltage then full wave rectified fed to main exciter way of voltage regulator the three phase winding on rotor now has a voltage induced in it which fed to dc main field way of a three phase rectifier network the dc main field rotates induces a voltage in ac output windings which at same time increases output of pilot exciter this sequence of events continues until generator reaches its regulated output voltage the output typically 200/115 volts three phase 400 hz. Question 26-17
The ignition system generally used small aircrafts a The voltage regulator. the sole purpose of ignition system to supply a high energy spark at right moment thereby igniting fuel air mixture so that engine can start its power stroke the source the spark comes from magnetos in magneto magnetic field generates a voltage in coil which transformed to a higher voltage a secondary coil with much more windings than primary coil a breaker contact in primary coil circuit interrupts flowing current this interruption causes magnetic field to collapse thereby generating a very high peak voltage in secondary coil this peak voltage then conducted to correct spark plugs the distributor high voltage leads. Question 26-18
Because of connection in parallel of electrical equipments on an ac bus bar isolation of individual equipments Decreases bus bar current consumption. In parallel ac current shared between different electrical equipments connected on bus bar if you disconnect one of them bus bar current consumption will be reduced. Question 26-19
Regarding 1 a fuse and 2 a circuit breaker ( ) not resettable (2) resettable. In parallel ac current shared between different electrical equipments connected on bus bar if you disconnect one of them bus bar current consumption will be reduced. Question 26-20
Regarding ohm's law The current in a circuit directly proportional to voltage. In parallel ac current shared between different electrical equipments connected on bus bar if you disconnect one of them bus bar current consumption will be reduced. Question 26-21
When ac generators are connected in parallel reactive loads are balanced means of The current in a circuit directly proportional to voltage. If generators are to be paralleled frequency adjusted adjusting csd output torque to balance real load the reactive loads are trimmed adjusting excitation current from voltage regulator. Question 26-22
Generators when connected to same bus bar are usually connected The current in a circuit directly proportional to voltage. If generators are to be paralleled frequency adjusted adjusting csd output torque to balance real load the reactive loads are trimmed adjusting excitation current from voltage regulator. Question 26-23
The advantages of nickel cadmium compared with lead acid batteries are 1 lower risk of thermal runaway2 higher internal resistance hence higher power3 reduced charging time4 constant output voltagethe combination which regroups all correct statements The current in a circuit directly proportional to voltage. If generators are to be paralleled frequency adjusted adjusting csd output torque to balance real load the reactive loads are trimmed adjusting excitation current from voltage regulator. Question 26-24
Static dischargers 1 are used to set all parts of airframe to same electrical potential 2 are placed on wing and tail tips to facilitate electrical discharge 3 are used to reset electrostatic potential of aircraft to a value approximating 0 volts 4 are located on wing and tail tips to reduce intererence with on board radiocommunication systems to a minimum 5 limit risks of transfer of electrical charges between aircraft and electrified clouds the combination regrouping all correct statements The current in a circuit directly proportional to voltage. We are not looking to set all parts of airframe to same electrical potential we are looking to maintain electrical airframe potential at around 10000 volts via static dischargers (by providing a path the electrons) example of static dischargers on a wing without static dischargers electrical airframe potential would rise up to a value 10 times higher would disturb and/or damage onboard equipment. Question 26-25
Assuming initiating cause removed which of these statements about resetting are correct or incorrect i a fuse resettable ii a circuit breaker resettable I incorrect ii correct. We are not looking to set all parts of airframe to same electrical potential we are looking to maintain electrical airframe potential at around 10000 volts via static dischargers (by providing a path the electrons) example of static dischargers on a wing without static dischargers electrical airframe potential would rise up to a value 10 times higher would disturb and/or damage onboard equipment. Question 26-26
Assuming initiating cause removed which of these statements about resetting are correct or incorrect i a fuse not resettable ii a circuit breaker resettable I correct ii correct. We are not looking to set all parts of airframe to same electrical potential we are looking to maintain electrical airframe potential at around 10000 volts via static dischargers (by providing a path the electrons) example of static dischargers on a wing without static dischargers electrical airframe potential would rise up to a value 10 times higher would disturb and/or damage onboard equipment. Question 26-27
The diagram shown in annex represents a twin engine aeroplane electrical system batteries are located at positions 877 I correct ii correct. each generator has its own busbar with non essential services connected to it or those that don't matter if it fails both are ultimately connected in parallel to a central (combining) busbar which carries essential services batteries are located on hot bus 1 hot bus 2 providing a source of power if both generators fail. Question 26-28
Electrical work measurement unit in international system of units si I correct ii correct. unit of force the unit of force in mks (metre kilogram second) system the force which gives to a mass of 1 kilogram an acceleration of 1 metre per second per second joule (unit of energy or work) the joule the work done when point of application of 1 mks unit of force newton moves a distance of 1 metre in direction of force watt (unit of power) the watt the power which in one second gives rise to energy of 1 joule ampere (unit of electric current) the ampere that constant current which if maintained in two straight parallel conductors of infinite length of negligible circular cross section placed 1 metre apart in vacuum would produce between these conductors a force equal to 2 x 10&8722 7 mks unit of force newton per metre of length ohm (unit of electric resistance) the ohm the electric resistance between two points of a conductor when a constant potential difference of 1 volt applied to these points produces in conductor a current of 1 ampere conductor not being seat of any electromotive force. Question 26-29
If two constant frequency ac generators are operating independently then phase relation between both generators I correct ii correct. unit of force the unit of force in mks (metre kilogram second) system the force which gives to a mass of 1 kilogram an acceleration of 1 metre per second per second joule (unit of energy or work) the joule the work done when point of application of 1 mks unit of force newton moves a distance of 1 metre in direction of force watt (unit of power) the watt the power which in one second gives rise to energy of 1 joule ampere (unit of electric current) the ampere that constant current which if maintained in two straight parallel conductors of infinite length of negligible circular cross section placed 1 metre apart in vacuum would produce between these conductors a force equal to 2 x 10&8722 7 mks unit of force newton per metre of length ohm (unit of electric resistance) the ohm the electric resistance between two points of a conductor when a constant potential difference of 1 volt applied to these points produces in conductor a current of 1 ampere conductor not being seat of any electromotive force. Question 26-30
The logic symbol shown represents assuming positive logic 880 An invert or not gate. A logic gate an elementary building block of a digital circuit most logic gates have two inputs one output at any given moment every terminal in one of two binary conditions low (0) or high (1) represented different voltage levels the logic state of a terminal can generally does change often as circuit processes data there are seven basic logic gates and or xor not nand nor xnor a logical inverter sometimes called a not gate to differentiate it from other types of electronic inverter devices has only one input it reverses logic state . Question 26-31
The connection in parallel of two 12 volt/40 amp hours batteries will create a unit with following characteristics 2 volt/ 8 amp hours. Battery packs achieve desired operating voltage connecting several cells in series with each cell adding to total terminal voltage 24 volt / 40 amp hours parallel connection attains higher capacity increased current handling as each cell adds to total current handling 12 volt/ 80 amp hours in parallel we increase flow in series we increase tension. Question 26-32
The capacity of a battery the Amount of ampere hours that a fully charged battery can supply. Battery packs achieve desired operating voltage connecting several cells in series with each cell adding to total terminal voltage 24 volt / 40 amp hours parallel connection attains higher capacity increased current handling as each cell adds to total current handling 12 volt/ 80 amp hours in parallel we increase flow in series we increase tension. Question 26-33
The frequency of current provided an alternator depends on Amount of ampere hours that a fully charged battery can supply. Battery packs achieve desired operating voltage connecting several cells in series with each cell adding to total terminal voltage 24 volt / 40 amp hours parallel connection attains higher capacity increased current handling as each cell adds to total current handling 12 volt/ 80 amp hours in parallel we increase flow in series we increase tension. Question 26-34
Direct current generators are connected In parallel to provide maximum power. Generators run most efficiently when loaded to their rated capacity therefore when load demand increases one or more generators can be connected in parallel to provide more power this the only way to reach maximum power with dc generators. Question 26-35
When carrying out a battery condition check using aircraft's voltmeter A load should be applied to battery in order to give a better indication of condition. Generators run most efficiently when loaded to their rated capacity therefore when load demand increases one or more generators can be connected in parallel to provide more power this the only way to reach maximum power with dc generators. Question 26-36
When a battery almost fully discharged there a tendency the Voltage to decrease under load. Generators run most efficiently when loaded to their rated capacity therefore when load demand increases one or more generators can be connected in parallel to provide more power this the only way to reach maximum power with dc generators. Question 26-37
To ensure correct load sharing between ac generators operating in parallel Both real reactive loads must be matched. Generators run most efficiently when loaded to their rated capacity therefore when load demand increases one or more generators can be connected in parallel to provide more power this the only way to reach maximum power with dc generators. Question 26-38
The frequency of an ac generator dependent on Number of pairs of poles the speed of moving part. The frequency of induced ac current depends on revolution of rotor since rate of revolution revolutions per minute (rpm) frequency expressed as cycles per second frequency of induced ac current will be rate of revolution of rotor divided 60 in addition to above if two magnets are used (two pole pairs) frequency doubled (tripled three) thus putting all of this in a formula we get frequency (hz) = rpm x number of pole pairs / 60. Question 26-39
If a current passed through a conductor which positioned in a magnetic field A force will be exerted on conductor. When a current passed through wire wrapped around a conductor its magnetic field penetrates conductor causes domains to turn aligning parallel to magnetic field so their tiny magnetic fields add to wire's field creating a large magnetic field that extends into space around magnet the larger current passed through wire coil more domains align the stronger magnetic field is. Question 26-40
The alternators when connected are usually connected A force will be exerted on conductor. When a current passed through wire wrapped around a conductor its magnetic field penetrates conductor causes domains to turn aligning parallel to magnetic field so their tiny magnetic fields add to wire's field creating a large magnetic field that extends into space around magnet the larger current passed through wire coil more domains align the stronger magnetic field is.
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